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Are you referring to products by Sevin? If so, they do kill quite a few insect pests, but you need to be very careful when and how you apply it (read the directions carefully).

I try to avoid...

You could also try lupines. They do well in cooler areas and shade, although they do require a little sun.

+1 on the butterfly bush vote. If they grow in your area, they will be loaded with butterflies by mid-summer!

My #1 all-time favorite is the gardenia. Rounding out the top 5 would be plumeria, hydrangea, hibiscus, and tulips... I think. It's hard to pick even a top 5 list.